Cats will take chicks as they are small. Most cats won't take on standard sized adult chicken; an occasional cat will go for small bantams. Your run should be covered to keep out all the critters who like chicken; hawks, raccoons, possums, the list goes on... Some losses may be unavoidable, but it will be ugly if things aren't secure, especially at night. Mary
sorry, I had a typo in my post and it sounded like I was the OP and I was just trying to say I had talked to my sister the night before about cat proof fenceing. sorry about that!